Rotary refiner liner construction



March 17, 1953 E. P. ARPIN, JR, ETAL 2,631,5

ROTARY REFINER LINER CONSTRUCTION E Filed Aug. 10, 1948 2 Sl-IEETS-SI-IEET l E57 z o @WWMEH E March 1953 E. P. ARPIN, JR., ETAL 2,631,505

ROTARY REFINER LINER CONSTRUCTION Filed Aug. 10, 1948 2 SHEETSSHEET 2 INVENTORS 12d Pfiqye Patented Mar. 17, 1953 ROTARY R FIN R LINER CO S UC ION Edmund P. Arpin, Jr., Neenah, Wis., and Raymood P. Frye, Chicago, 111.; said Frye assignor to sa Arv n, J

Application August 10, 1948 Serial No. 43,474

2 Claims.

1 This invention relates to improvements in th construction of liners for. a rotary refiner. Specifically it has to do with improvements in the manner in which the inner abrasive lining is secured to the outer metal backin member in a rotary machine for refining wet fibrous material, such as pulp, paper stock, and the like.

In the copending application of Edmund P. Arpin, Jr., one of the present inventors, U. S. Serial No 640,734, now issued as Patent No. 2,475,869, there was disclosed and claimed an improved rota-ry refiner wherein an abrasive liner, formed of a plurality of ring members is mounted in a cylindrical casing or shell. Rotary refining elements, connected to a central rotating shaft, are caused to bear against the inner abrasive surface of the ring unit under the action of centrifugal force and to process the fibrous material which is forced under pressure between the refining surfaces.

Such an arrangement, while efiicient inv operation, has no provision for cooling the abrasive liner. Also, the use of ring members limits the size of the machine since these members are heavy and difficult to handle. Further, the use of a plurality of ring members and a solid cylindrical shell makes the assembly or dismantling of the machine difficult since each ring member must be positioned and aligned individually in the casing.

With the foregoing in mind, it is an important object of-the present invention to provide a liquid cooled abrasive liner for a rotary refiner.

Another object of the present invention is to provide a liner composed of a plurality of halfring members suitably bonded to a semi-cylindrical metal backing member, affording a unitary structure in the form of a semi-cylinder which may be conveniently handled by a chain fall or the like for easy positioning or removal of the unit from the casing.

still another object of the present invention is to provide a refiner having an outer shell which coacts with an abrasive liner to define a passage for liquid for cooling the liner.

In accordance with the teachings of the -l resent invention, an outer shell is provided comprising two semi-cylindrical metal members arranged to be secured together at marginal flange portions to form a cylinder, which is usually, but not necessarily, positioned with its axis substantially horizontal. A composite abrasive liner is fitted inside the outer shell com-prising two semi cy- 'lindr-ical perforated metal backing members. each backingmember carrying a plurality of halferings T.

l 2 Which are secured thereto by a suitable bonding material such as cement.

The perforated metal backing members are also provided with peripheral flanges extending therearound to hold the composite abrasive liner spaced from the outer metal shell to afiord an annular passage for the circulation of cooling water around the liner.

It is contemplated in this invention that each half of the composite abrasive liner may be handled as a unit in assembling and disassembling the refiner. Also, since the outer shell is made up of semi-cylindrical members bolted together at longitudinal fiange portions, the upper half may be easily removed from the lower half, thus elimihating the necessity for endwise insertion of the abrasive liner in the shell.

It is a feature of this type of construction that the size of the rotary liner need not be limited since, instead of forming the top of this abrasive liner 'as a semi-cylindrical unit, the unit may advantageously be made as a third or even a quarter of a cylinder.

A further feature of this invention is the p vision of a novel packing ring for sealing the end joint of the water passages.

Other and further important features, objects and advantages of the present invention will be apparent to one skilled in the art from the disclosure in the specification and the accom-= panying drawings.

On the drawings:

Figure l is a side elevational view of a rotary refiner having a shell and abrasive liner construction according to the teachings of the present invention and having parts broken away and parts in section to more clearly dis-close the mechanism.

Figure 2 is a vertical cross-sectional view taken on line IIII of Figure 1;

Figure 3 is a fragmentary side elevational view of two detached perforated backing members featured in the novel composite liner construction of the present invention;

Figure 4 is a greatly enlarged vertical sectional view of a portion of the seal ring of the present invention.

As shown on the drawings:

In Figure 1 the reference numeral It indicates a rotary refiner for processing wet fibrous material such as wood pulp. This refiner comprises an outer casing including a cylindrical shell H which is secured, as by cap screws 12, to end plates l3 and I l each of which has a dished central portion I to and Ma respectively and a central axially apertured flange 15b and Mb respectively in which is suitably journaled a hollow rotatable shaft IS. The end plates [3 and I4 may advantageously be made in half portions suitably secured at flanged portions by bolts I6.

The material to be processed enters the machine under pressure through an intake port I! in the end plate [3 and is forced, by means of an impeller member l8. between the inner cylindrical surface of a composite abrasive liner [8 and a plurality of refining elements 28 which are rotated inside the abrasive liner l9 through linkages 22 by the rotatable shaft 15. The refining elements 29 are urged by centrifugal force against the abrasive liner and the operating clearance between the refining elements, and the liner is controlled externally of the machine through a plurality of rods 23 connected to coneshaped adjusting members 23a. The material passes along between this processing surface and is finally discharged from the machine through a port 24 in the end plate 14. For further description of the mechanism for controlling the operating clearance between the refining elements and the liner, reference is made to the above-mentioned Arpin Patent No. 2,475,869.

The outer shell H is made up of two semicylindrical shells 25 and 26 each having side flanges 25a and 26a extending longitudinally of the machine. These shells are secured together by means of bolts 29 passing through aligned holes in the flanges of the shells. Leg members 32 secured to the lower shell 25 support the refining machine in spaced relation above the floor.

A pipe 34 is threaded in an opening extending through the wall of the shell 25 while a second pipe 35 is threaded through the wall of the shell 26. The pipe 34 may be suitably connected to a source of liquid coolant such as water while the pipe 35 may lead to a convenient storage tank or to a drain.

The composite abrasive liner I9 (Figure 2) is in the form of a cylinder made up of two semicylindrical units each of which comprises a semicylindrical perforated metal backing member 38 and a plurality of half-ring abrasive members 39 which are placed side by side and bonded to the backing member 38 by a bonding agent such as cement, or a sulfur plastic or metal matrix. As clearly seen in Figure 2, the cement passes through the perforations 38a in the backing member and, upon setting, causes the abrasive half-rings to be bonded to the backing member.

The backing members 38 are also provided with longitudinal flanges Gil and lateral flanges 42 which space the backing members 38 from the outer shell H to define liquid coolant passages for cooling the abrasive liner during operation. Cut-out portions id in the flanges 49 and d2 permit passage of coolant from the intake pipe 34 to the discharge pipe 35. It will be understood of course that the cut-out portions 44 may be suitably placed in the flanges so as to cause an effective, circuitous path for the coolant liquid to attain a maximum cooling effect.

To prevent leakage of liquid coolant at the end portions of the machine, an annular seal ring 46, preferably made of leather, is tightly held against the lateral peripheral flange 42 at either end of the backing member 33. This is accomplished by a retaining ring 4'5 and a plurality of cap screws =38 which pass through the retaining ring 41 and the seal ring it for threaded engagement in the backing member 38 The '4 seal ring 46 has a flange portion 49 fitting between the outer peripheral edge of the flange 42 and the inner cylindrical surface of the shell The outside diameter of the peripheral flanges 42 is such that the composite abrasive liner 19 will fit inside the shell H with a slightly smooth fit, cushioned at its joints by a thin graphite mixture to permit easy removal of the unit. If it is desired to secure the liner 19 to the shell I I, holes 5| may be provided in the shell H in alignment with tapped holes 52 in the backing member 38 at the intersection of the flanges 58 and 42, as shown in Figure 1. Cap screws 54 disposed through these aligned holes will serve to secure the members together during operation of the machine. Upon dismantling the machine, eye bolts may be screwed into the holes 52 to facilitate handling of the semi-cylindrical abrasive liner unit.

It will be noted in Figure 2 that a longitudinal flange 40 is provided at the marginal edge of each backing member 38 affording means for securing the composite unit together by means of dowel pins 56 and bolts 51. A gasket 59, made of a material such as hard wood, is disposed between the abutting flanges lit and between the surfaces of the abrasive half-rings to prevent chipping during assembly of the refiner and cracking during operation.

From the foregoing description it is seen that there is provided in this invention a novel composite abrasive liner which may be preassembled and aligned as a unit prior to insertion in a rotary refiner machine. A novel segmentalouter shell construction permits disposition of the composite liners in the machine through the open top thereof when the upper shell segment is removed. There is also provided in this invention an effective means for cooling the abrasive liner and seal rings for preventing loss of coolant liquid during operation.

It will, of course, be understood that various details of construction may be varied through a Wide range without departing from the principles of the present invention, and it is, therefore, not the purpose to limit the patent granted hereon otherwise than necessitated by the scope of the appended claims.

We claim as our invention:

1. In a rotary refiner of the type wherein a fibrous material is processed by rotating refining elements; segmental cylindrical shell members secured together to define a cylindrical shell, a liner disposed in said shell comprising segmental cylindrical liner units, each unit including a segmental cylindrical backing plate member having longitudinally spaced lateral peripheral flanges projecting from the outer surface thereof, adjacent backing plate members having mating marginal flanges secured together to define a cylindrical backing extending in spaced relation to and within said cylindrical shell, and a plurality of segmental cylindrical abrasive liner members bonded side by side to the inner surface of each of said backing plate members along the length of said backing plate members, whereby.

each backing plate member and the abrasive liner members bonded thereto may be handled as an individual unit.

2. In a rotary refiner of the type wherein a fibrous material is processed by rotating refining elements; segmental cylindrical shell members secured together to define a cylindrical shell, a liner disposed in said shell comjprising segmental cylindrical liner units, each unit including a segmental cylindrical backing plate member having longitudinally spaced lateral peripheral flanges projecting from the outer surface thereof, adjacent backing plate members j'having mating marginal flanges secured together to define a cylindrical backing extending in spaced relation to and within said cylindrical shell, a plurality of segmental cylindrical abrasive liner members bonded side by side to the inner surface of each of said backing plate members along the length of said backing plate members, whereby each backing plate member and the abrasive liner members bonded thereto may be handled as an individual unit, and annular seal rings having inturned marginal flanges extending in overlapping relation tothe outer sides of said longitudinally spaced lateral peripheral flanges of said backing plate members to define with the outer peripheral surfaces; of said backing plate members and the inner sides of said spaced lateral peripheral flanges liquid coolant passages for cooling of the abrasive liner members during operation. EDMUND P. ARPIN, JR.

RAYMOND P. FRYE.

REFERENCES CITED The following references are of record in the file of this patent:

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